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Why does solid wood floor have noise

Solid wood floor in the process of using the sound is not a product quality problem, has been the industry often talk about the topic, so what are the reasons for the sound of solid wood floor?
Let's first understand how important installation is.
1. Uneven ground: according to the specifications of wood floor paving, acceptance and use, the flatness of the ground is ≤ 5mm / 2m (detected with a 2m guiding rule), and the flatness after the installation of wood keel is ≤ 3mm / 2m. The actual flatness of the ground is difficult to meet the requirements. The installation personnel have to add gaskets under the wood keel, some of which are not padded or leveled. After the floor is installed, the floor is uneven, Part of the floor is not completely in contact with the wooden keel, so people will make noise when they walk on the floor. This kind of situation will ring immediately after installation, and it is local.
2. The distance of wooden keel is too far: the distance of keel should not be too far, generally not more than 350mm. The distance of some wooden keel is 450mm or even far away. When the heavier person steps on a single floor, the floor will have a larger deflection downward, and the side of the floor will rub with the adjacent floor, resulting in a sound. If this is the reason, as long as you step on a single floor, it will sound, but if you step on multiple floors, it will not sound, and it will happen after installation.
3. The moisture content of wood keel is quite large: in some areas, the moisture content of wood keel is quite different when it is piled up in the open air without drying. In the same batch of wooden keels, some have a moisture content of about 10%, and some have a moisture content of more than 25%. Even if the installation personnel lay the wooden keel very flat, the floor may not sound temporarily after installation. In the process of use, after the moisture content of the wooden keel is rebalanced, there will be uneven, and walking on the floor will produce a sound. The feature is: it doesn't sound when it is installed, and it will sound after a period of use. There are not many noise producing areas. Therefore, the wooden keel should be dried, and some installers take measures to finish the wooden keel, temporarily do not install the floor, place it for about a week, and then re level and re pave it, which can reduce the probability of such problems.
4. Suspended paving floor: the environment in northern China is dry in winter and wet in summer. The moisture content of the floor changes alternately. Due to suspended paving, the floor can not be fixed, and the floor with special structure will be distorted. Stepping on the deformed floor will produce sound.
5. Improper moisture-proof measures: when the floor is installed, due to improper moisture-proof measures, tile deformation occurs after the floor is damp. When the tile deformation is serious, the floor will not produce sound, because the floor is over expanded and squeezed tightly. At this time, people walk on the floor, and the floor will not move up and down, so there will be no mutual friction and sound.
6. Insufficient reserved gap: the solid wood floor has the characteristics of dry shrinkage and wet expansion. When installing the floor, the gap between the floor strips must be reasonably reserved according to the actual moisture content of the floor, the dry shrinkage coefficient of the wood and the balanced moisture content of the local area. If the reserved gap between the floor strips is insufficient when the floor is installed, the floor will produce slight extrusion, some places will slightly bulge, and there will be a gap between the floor and the wooden keel or cushion, so people will make a sound when walking on the floor. When the solid wood floor is installed, the cushion is laid on the wood keel, and the damp proof film is laid on the cushion, which can effectively control the influence of the external environment on the floor and prevent the tile deformation of the floor.